Mozilla is still aiming for a feature-freeze of Firefox 4 on September. Features that are not included then, will not make it in the final version.

Mozilla confirmed during today’s status update that the feature-freeze will be next week, on September 1. Developers were told that “remaining reviews and tests” need to be wrapped up now and code needs to be stabilized. According Mozilla’s meeting minutes from today, “a lot of work needs to stabilize quickly, or miss [Firefox 4].”

It is unclear what that will be, but it appears that Tab Candy will be integrated. Hardware acceleration is already a part of Firefox, but will miss Firefox 4 Beta 4, which was due today, but will slip to tomorrow, we hear. The status of the new JaegerMonkey JavaScript engine is unclear, as there is no Firefox build with this engine available yet. However, the developer team is reporting performance improvements several times a week. Right now, JaegerMonkey has taken Firefox below the 500 ms mark to about 496 ms in Webkit’s Sunspider benchmark. The goal is about 400 ms or slightly less.

JaegerMonkey was planned to land on September 1 in Firefox, but there is no information whether this plan is still on track.

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